JP2015227129A - Foundation structure for on-water wind power generator, on-water wind power generator, and method for building on-water wind power generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily install and stably hold a wind power generation part at an offshore installation position at low cost.SOLUTION: A foundation structure 30 for an on-water wind power generator 10 uses a floating part 31 to hold a wind power generation part 20 at an offshore installation position P. The floating part 31 includes: a floating body 33 having a buoyancy body 35 and a plurality of leg members 36, the buoyancy body being disposed in water and supporting the wind power generation part 20, the leg members 36 extending from the buoyancy body 35 toward a water bottom B and being circumferentially arranged around the buoyancy body 35 in a planar view of the floating part 31; and a weight 34 attached to the ends at the water bottom B side of the leg members 36 at the installation position P.

Description

  The present invention relates to a foundation structure for a water wind power generator, a water wind power generator, and a method for manufacturing the water wind power generator.

  2. Description of the Related Art Conventionally, for example, a configuration as described in Patent Document 1 below is known as a basic structure for a floating wind power generator that holds a wind power generator at an offshore installation position by a floating body.

JP 2009-18671 A

  However, there is room for improvement in the conventional foundation structure for the offshore wind power generation apparatus in which the wind power generation section is stably installed while being easily installed at an offshore installation position at a low cost.

  This invention is made | formed in view of the situation mentioned above, Comprising: It aims at hold | maintaining a wind power generation part stably, installing in an offshore installation position easily at low cost.

In order to solve the above problems, the present invention proposes the following means.
A foundation structure for a floating wind power generator according to the present invention is a foundation structure for a floating wind power generator that holds a wind power generator at an offshore installation position by a floating body, and the floating body is disposed in water and is A buoyancy body that supports a wind power generation unit, and a floating body body that has a plurality of leg members that extend from the buoyancy body toward the bottom of the water and that are arranged in a circumferential direction around the buoyancy body in a plan view of the floating body portion; And a weight attached to an end of the leg member on the water bottom side at the installation position.

In this case, the wind power generation unit can be held on the water at the installation position without being submerged in water due to the buoyancy that the floating body receives. In addition, the weight of the weight can prevent the entire floating body from floating on the water, and the wind power generation section can be stably held by the floating body.
Here, since a plurality of leg members are arranged in the circumferential direction in a plan view, for example, while securing the stability in the circumferential direction in the floating body as compared with the case where the buoyant body is simply extended toward the bottom of the water, for example. It is possible to suppress an increase in the volume of the entire floating body, and it is possible to suppress excessive buoyancy from acting on the floating body. As a result of the buoyancy not being lowered, the distance between the buoyancy and the center of gravity can be maintained, and stability can be reliably ensured.
And since the weight is attached to the end of the bottom side of such a leg member, for example, when the floating body portion does not include the weight, the weight is provided not on the leg member but on the buoyancy body. Compared with the case where it exists, the gravity center in the whole floating-body part can be lowered | hung to the water bottom side. Thereby, the gravity center of the whole floating body part can be largely separated from the buoyancy body to the water bottom side while suppressing the vertical size of the floating body main body. Therefore, for example, even if the wind power generation unit receives a wind load in the horizontal direction and a horizontal overturning moment occurs in the wind power generation unit, it is possible to ensure a large restoring moment by the floating body unit. The fall of the part can be effectively prevented.
In addition, since the weight is attached to the leg member at the offshore installation position, after carrying out the transport process of transporting to the installation position while supporting the wind power generation unit with the floating body, the weight is attached to the leg member at the installation position A process can be performed. Therefore, it is possible to transport the wind power generation unit to the offshore installation position in a state where the weight is not attached to the floating body, and the wind power generation unit can be easily transported to the installation position.

  The leg member may be extended in the horizontal direction by being bent starting from a node provided on the leg member.

  In this case, since the leg member is bent in the horizontal direction by being bent starting from the node portion, the leg member is bent before the transport process, and the vertical size of the floating body is set during the transport process. The leg member can be deformed from the node portion as a starting point and can be extended to the bottom of the water along the vertical direction while keeping the length small.

  The plurality of leg members may be bent while being shifted from each other in the circumferential direction when each of the leg members is bent starting from the node.

  In this case, the plurality of leg members are bent in a state where they are shifted from each other in the circumferential direction when each leg member is bent with the node as a starting point, so that the leg members are bent before the transporting process. Thus, the plurality of leg members can be extended while being shifted from each other in the circumferential direction during the transport process.

  In the bent leg member bent from the node, an auxiliary floating body may be provided at an end located on the opposite side of the buoyant body along the horizontal direction.

  In this case, in the bent leg member, the auxiliary floating body is provided at the end located on the opposite side of the buoyant body along the horizontal direction. Therefore, wind power generation is performed by the buoyancy received by the auxiliary floating body during the transport process. The part can be supported more stably.

  As the node portion, the leg member is provided with a first node portion and a second node portion arranged to be shifted from each other in the vertical direction, and the first node portion and the second node portion include the leg member, You may bend in the horizontal direction to the mutually opposite side.

In this case, since the first node and the second node bend the leg members in the opposite directions in the horizontal direction, the leg members are overlapped in the vertical direction by bending each node starting from each node. Therefore, it is possible to make the floating body main body compact by keeping the horizontal size of the bent leg member small.
In the case where the first knuckle is provided at a portion of the leg member connected to the buoyant body, and the second knuckle is provided at the center of the leg member in the vertical direction, the bent leg member The horizontal size can be reduced to about half.

  The weight may be attached to the leg member so as to be able to vibrate independently from the floating body.

  In this case, since the weight is attached to the leg member so as to be able to vibrate independently from the floating body, for example, when an external force is applied to the floating body and the floating body tries to vibrate in the horizontal direction, The weight can be vibrated independently from the floating body.

  The floating body is moored to the bottom of the water via a mooring section, and the mooring section includes a mooring line having one end fixed to the floating body and the other end fixed to the bottom. A plurality of circumferentially arranged parts are gradually separated from the floating body part in the horizontal direction from one end part toward the other end part, and in the middle part located between the one end part and the other end part in the mooring line. An intermediate weight may be provided.

  In this case, since an intermediate weight is provided in the middle part of the mooring line, the mooring line is applied to the mooring line while applying a constant weight to the mooring line by applying the weight of the intermediate weight to the mooring line. Can be bent so as to be convex toward the bottom of the water. Therefore, for example, when the floating body moves in the vertical or horizontal direction due to waves, tidal currents, winds, etc., the mooring line is deformed so as to reduce or increase the flexure, so that the mooring line is removed from the floating body. It is possible to gradually increase the reaction force applied to the hull, and to suppress a sudden large reaction force from the floating body portion to the mooring line.

  The surface wind power generator according to the present invention is characterized in that a wind power generation unit is held by the foundation structure for the surface wind power generator.

  The method for manufacturing a surface wind power generator according to the present invention is a method for manufacturing a surface wind power generator that forms the surface wind power generator, and transports the wind power generation unit to the installation position while being supported by the floating body. And a mounting step of attaching the weight to the leg member at the installation position after the transporting step.

  According to the first aspect of the present invention, the wind power generation unit can be effectively prevented from overturning at the installation position, and the wind power generation unit can be easily transported to the installation position. The section can be stably held while being easily installed at an offshore installation position at low cost.

  According to the second aspect of the present invention, since the size of the floating body in the vertical direction can be kept small during the transport process, for example, the wind power generation unit can be transported easily even in shallow water areas. .

  According to the invention of claim 3, since the plurality of leg members can be extended in a state shifted from each other in the circumferential direction during the transport process, each leg member receives buoyancy during the transport process. Thus, the wind power generation unit can be transported while being stably supported, and the wind power generation unit can be transported more easily.

  According to the invention which concerns on Claim 4, in a conveyance process, since a wind power generation part can be supported more stably, a wind power generation part can be conveyed still more easily.

  According to the invention according to claim 5, since the floating body can be made compact, for example, when carrying out an assembly process for assembling the floating body on land, it is possible to save space or When carrying out the transfer process of transferring to the water, the transfer device required for transferring the floating body can be simplified.

  According to the invention of claim 6, since the weight can be vibrated independently from the floating body, for example, by making the vibration modes of the floating body and the weight different from each other, The vibration can be attenuated, and the wind power generation unit can be held more stably.

  According to the seventh aspect of the present invention, it is possible to suppress a sudden large reaction force from the floating body portion to the mooring line. For example, the mooring line is damaged by the reaction force applied from the floating body portion to the mooring line. This can be suppressed. Thereby, compared with the case where an intermediate weight is not provided in the mooring line, for example, the wind power generation unit can be held more stably while the mooring unit is made compact in the horizontal direction.

  According to the invention of claim 8, since the wind power generation unit is held by the foundation structure for the offshore wind power generation device, the wind power generation unit can be stably installed at a low cost at a low cost. Can be held.

  According to the ninth aspect of the present invention, since the floating wind power generator is formed by carrying out the attachment process after the transport process, the wind power generation unit can be easily installed at an offshore installation position at low cost. It can be held stably.

It is a front view which shows the surface wind power generator concerning 1st Embodiment of this invention. It is a figure explaining the transfer process in the manufacturing method of the floating wind power generator which forms the floating wind power generator shown in FIG. 1, Comprising: It is a front view of a wind power generation part and a floating body main body. It is a top view of the floating body main body shown in FIG. It is a figure explaining the attachment process in the manufacturing method of the surface wind power generator which forms the surface wind power generator shown in FIG. 1, Comprising: It is a front view of a wind power generation part and a floating body part. It is a figure explaining the mooring process in the manufacturing method of the surface wind power generator which forms the surface wind power generator shown in FIG. 1, Comprising: It is a front view of a wind power generation part, a floating body part, and a mooring part. It is an enlarged view of the principal part of the mooring part which comprises the surface wind power generator shown in FIG. It is a graph which shows the relationship between the horizontal displacement of the mooring line of the mooring part which comprises the surface wind power generator shown in FIG. 1, and the horizontal component of mooring force. It is a perspective view which shows the principal part of the surface wind power generator concerning 2nd Embodiment of this invention. It is a figure explaining the attachment process in the manufacturing method of the surface wind power generator which forms the surface wind power generator shown in FIG. 8, Comprising: It is a perspective view which shows the principal part of a surface wind power generator. It is a top view of the floating body main body in the bending state in which the leg member which comprises the surface wind power generator shown in FIG. 8 was bent. It is a perspective view of the floating body main body shown in FIG.

(First embodiment)
Hereinafter, with reference to drawings, the surface wind power generator concerning a 1st embodiment of the present invention is explained.
As shown in FIG. 1, the surface wind power generator 10 includes a wind power generation unit 20 and a foundation structure 30 (hereinafter referred to as “foundation structure”) for the surface wind power generator. The offshore wind power generation apparatus 10 is installed at a predetermined installation position P offshore. The surface wind power generator 10 is mainly installed in the ocean, but can be installed in a lake, for example.

  The distance from the land portion at the installation position P is not particularly limited. Moreover, the water depth in the installation position P is not specifically limited, For example, as the installation position P, the water depth is less than 1000 m, more specifically, the water depth is about 30 m to 500 m. The surface wind power generator 10 can be installed on water having a wave height of about 10 m, for example.

  The wind power generation unit 20 is blown with wind generated on the water, and converts wind energy of the wind into electric power energy. In the illustrated example, the mass of the wind power generation unit 20 is, for example, about 10,000 tons or less.

  The wind power generation unit 20 includes a tower 21, a nacelle 22, and a blade 23. The tower 21 is erected on the foundation structure 30 and extends in the vertical direction. The nacelle 22 is provided in the upper end part of the tower 21, and accommodates the generator etc. which are not shown in figure. The blades 23 extend radially from the nacelle 22 in a front view of the wind power generation unit 20 to constitute a windmill. When wind is blown onto the wind power generation unit 20, the wind energy is converted into electric energy by the blade 23 (windmill) turning around the nacelle 22 in the front view.

The foundation structure 30 includes a floating body portion 31 that holds the wind power generation unit 20 at an offshore installation position P, and a mooring portion 32 that anchors the floating body portion 31 to the water bottom B (sea bottom, lake bottom).
The floating body portion 31 includes a floating body main body 33 and a weight 34. The floating body 33 includes a buoyancy body 35 that is disposed in water and supports the wind power generation unit 20, and a leg member 36 that extends from the buoyancy body 35 toward the bottom B.

  The buoyancy body 35 is a so-called spar having a hollow cylindrical shape, in the illustrated example, a hollow cylindrical shape. The buoyancy body 35 is joined to the lower end portion of the tower 21. At least a part of the buoyancy body 35 is disposed in the water. In this embodiment, the upper end of the buoyancy body 35 is disposed at a position equivalent to the water surface S in the vertical direction, and the entire buoyancy body 35 is disposed in the water. Has been. Inside the buoyancy body 35, entry of water from the outside is restricted, and for example, a gas such as air is accommodated.

  The leg members 36 are arranged in a circumferential direction (circumferential direction of the buoyant body, hereinafter referred to as “circumferential direction”) that circulates around the buoyant body 35 in a plan view (hereinafter referred to as “planar view”) when the floating body portion 31 is viewed from above. A plurality, three in the illustrated example, are arranged. The leg member 36 is formed in a truss shape. The leg member 36 includes a plurality of base members 36a that extend in the vertical direction and are spaced apart in the horizontal direction, and a plurality of diagonal members 36b that connect the plurality of base members 36a. In the illustrated example, one upper end portion of the plurality of base members 36 a is connected to the lower end portion of the buoyancy body 35.

  The leg member 36 is provided with a node portion 37a. As shown in FIG. 2, the leg member 36 is extended in the horizontal direction by being bent with the node portion 37a as a starting point. As the node part 37a, the 1st node part 37a provided in the part connected with the buoyancy body 35 in the leg member 36 is provided. The first knot 37a is provided at the upper end of the leg member 36, and bends the entire leg member 36 outwardly along the radial direction of the buoyancy body 35 (hereinafter referred to as "radial direction"). The first knot portion 37a is configured such that the upper end portion of the leg member 36 is attached to the lower end portion of the buoyancy body 35 so as to be rotatable about a rotation axis extending in the circumferential direction.

  As shown in FIG. 3, the plurality of leg members 36 are bent while being shifted from each other in the circumferential direction when each leg member 36 is bent starting from the node portion 37 a. In the present embodiment, each leg member 36 extends along the radial direction in a bent state bent from the node portion 37a, and the leg members 36 adjacent to each other in the circumferential direction have an equal interval in the circumferential direction. It is arranged with a gap. The plurality of leg members 36 have a radial shape in plan view when each leg member 36 is bent starting from the node portion 37a.

  As shown in FIG. 1, the weight 34 is attached at the installation position P to the lower end of the leg member 36 that is the end of the bottom B side. The weight 34 is integrally attached to each lower end portion of the plurality of leg members 36. The weight 34 is suspended from a lower end portion of the leg member 36 via a suspension line 39 so as to be swingable, and can be vibrated independently of the floating body 33. The weight 34 may be attached to, for example, a lower end portion of the leg member 36 by a pin member extending in the horizontal direction, and may be swingable about the axis of the pin member with respect to the leg member 36. .

  The mooring portion 32 is provided with a mooring line 40 having one end fixed to the floating body 31 and the other end fixed to the water bottom B. The mooring line 40 is formed by, for example, a cable or a chain. A plurality of mooring lines 40 are arranged in the circumferential direction, and gradually move away from the floating body 31 in the horizontal direction from one end to the other end.

  One end of the mooring line 40 is fixed to the buoyancy body 35. A weight body 41 that sinks into the bottom B is fixed to the other end of the mooring line 40, and the other end of the mooring line 40 is fixed to the bottom B by the weight of the weight body 41. The other end of the mooring line 40 is fixed via the weight body 41, so that the load on the ground is suppressed and the cost is reduced.

  An intermediate weight 42 is provided at an intermediate portion located between one end and the other end of the mooring line 40. The intermediate weight 42 is provided at the center of the mooring line 40 that is located at the center along the direction in which the mooring line 40 extends. The intermediate weight 42 causes the mooring cable 40 to protrude toward the bottom B while applying a constant tension to the mooring cable 40 by applying the weight of the intermediate weight 42 to the mooring cable 40. It is bent to become. The mooring line 40 is bent so as to be convex toward the bottom B with the intermediate weight 42 as a starting point.

  Next, a method for manufacturing a floating wind power generation apparatus (installation method of a wind power generation section) in which the wind power generation section 20 is installed at the offshore installation position P by the foundation structure 30 to form the above-described wind power generation apparatus 10 will be described.

First, as shown in FIGS. 2 and 3, a transfer process of transferring the floating body 33 formed on the land L from the land L to the water is performed. At this time, in this embodiment, the floating body part 31 is formed at the bay port, and is transferred from the bay port to the water using a transfer device such as a crane. At this time, the leg member 36 is kept in a bent state, and the auxiliary floating body 43 is detachably provided at an end portion of the leg member 36 located on the opposite side of the buoyant body 35 along the horizontal direction.
Moreover, the arrangement | positioning process which arrange | positions the wind power generation part 20 on the floating body main body 33 is implemented. In this embodiment, an arrangement | positioning process is implemented after a transfer process and the wind power generation part 20 is arrange | positioned on the floating body 33 transferred on the water.

Thereafter, as shown in FIG. 4, a transporting process is performed in which the wind power generation unit 20 is transported to the offshore installation position P while being supported by the floating body 33. At this time, the wind power generator 20 is conveyed by chartering the floating body 33 with a hull (not shown).
Further, a weight transporting process is performed in which the weight 34 is transported to the offshore installation position P in a state separated from the floating body 33. At this time, in this embodiment, the weight 34 conveyed to the installation position P is submerged in the water bottom B.

Then, an attachment process for attaching the weight 34 to the leg member 36 at the installation position P is performed.
At this time, in this embodiment, for example, after the pulling cable 45 is extended from the water such as the wind power generation unit 20 into the water, the hanging wire 39 is coupled to the pulling cable 45, and then the pulling cable 45 is pulled up and overlapped. The weight 34 is lifted from the bottom B together with the suspension line 39. The pulling cable 45 may be extended into the water through the inside of the buoyancy body 35.
Further, the auxiliary floating body 43 is detached from each leg member 36, and each leg member 36 is deformed starting from the node portion 37a and extended toward the bottom B along the vertical direction. At this time, the auxiliary floating body 43 may remain attached to the leg member 36.
Then, as shown in FIG. 5, the weight 34 pulled up from the water bottom B is connected to the lower end portion of the leg member 36 extending toward the water bottom B along the vertical direction.

In addition, a mooring step of mooring the floating body portion 31 to the bottom B by the mooring portion 32 is performed.
At this time, in this embodiment, while fixing the other end part of each mooring line 40 to the bottom B, the buoy 44 is detachably attached to one end part of each mooring line 40, and one end part of each mooring line 40. Is suspended on the water surface S so as to be visible. Then, the floating body 31 is moored to the bottom B by fixing one end of each mooring line 40 to the floating body 31.

  As described above, according to the floating wind power generator 10 and the foundation structure 30 according to the present embodiment, the wind power generation unit 20 is held on the water at the installation position P without being submerged by the buoyancy received by the floating body 33. can do. In addition, it is possible to prevent the entire floating body 33 from floating on the water due to the dead weight of the weight 34, and the floating body portion 31 can stably hold the wind power generation unit.

Here, since a plurality of leg members 36 are arranged in the circumferential direction in plan view, for example, the stability in the circumferential direction of the floating body 33 compared to a case where the buoyant body 35 is simply extended toward the bottom B, for example. As a result, it is possible to suppress an increase in the volume of the entire floating body 33 and to prevent an excessive buoyancy from acting on the floating body 33. As a result of the buoyancy not being lowered, the distance between the buoyancy and the center of gravity can be maintained, and stability can be reliably ensured.
And since the weight 34 is attached to the lower end part which is the edge part by the side of the water bottom B in such a leg member 36, when the floating body part 31 is not provided with the weight 34, for example, the weight 34 Compared to the case where the buoyancy body 35 is provided instead of the leg member 36, the center of gravity of the entire floating body 31 can be lowered to the bottom B. Thereby, the gravity center of the whole floating body part 31 can be largely separated from the buoyancy body 35 to the water bottom B side while suppressing the size of the floating body 33 in the vertical direction. Therefore, for example, even if the wind power generation unit 20 receives a wind load in the horizontal direction and a horizontal overturning moment occurs in the wind power generation unit 20, it is possible to ensure a large restoring moment by the floating body unit 31. And the fall of the wind power generation part 20 can be prevented effectively.

  In addition, since the weight 34 is attached to the leg member 36 at the offshore installation position P, after carrying out the transporting process of transporting the wind power generation unit 20 to the installation position P while being supported by the floating body 33, the weight 34 is loaded at the installation position P. An attaching step for attaching the weight 34 to the leg member 36 can be performed. Therefore, it is possible to transport the wind power generation unit 20 to the offshore installation position P in a state where the weight 34 is not attached to the floating body 33, and the wind power generation unit 20 can be easily transported to the installation position P. be able to.

  As described above, the wind power generation unit 20 can be effectively prevented from falling at the installation position P, and the wind power generation unit 20 can be easily transported to the installation position P. 20 can be stably held while being easily installed at an offshore installation position P at low cost.

  Further, as shown in FIGS. 2 and 3, since the leg member 36 is bent in the horizontal direction with the node portion 37a as a starting point, the leg member 36 is bent before the transporting process and transported. During the process, the vertical size of the floating body 33 is kept small, and after the transport process, the leg member 36 is deformed starting from the node portion 37a, and the leg member 36 is moved to the bottom B side along the vertical direction. Can be extended. Thus, since the size of the floating body 33 in the vertical direction can be kept small during the transporting process, the wind power generation unit 20 can be transported easily even in a shallow water region, for example.

  Further, since the plurality of leg members 36 are bent while being shifted from each other in the circumferential direction when each leg member 36 is bent starting from the node portion 37a, the leg members 36 are bent before the transporting process. Thus, the plurality of leg members 36 can be extended while being shifted from each other in the circumferential direction during the transport process. As a result, each leg member 36 receives buoyancy during the transport process, so that the wind power generation unit 20 can be transported while being stably supported, and the wind power generation unit 20 can be transported more easily. it can.

  Further, in the leg member 36 in the bent state, the auxiliary floating body 43 is provided at the end located on the opposite side of the buoyant body 35 along the horizontal direction, so that the buoyancy received by the auxiliary floating body 43 during the transporting process is provided. The wind power generation unit 20 can be supported more stably. Therefore, the wind power generation unit 20 can be transported more easily.

  Since the weight 34 is attached to the leg member 36 so as to be able to vibrate independently from the floating body 33, for example, when an external force is applied to the floating body 33 and the floating body 33 attempts to vibrate in the horizontal direction. For example, the weight 34 can be vibrated independently from the floating body 33. Therefore, for example, by making the vibration modes of the floating body 33 and the weight 34 different from each other, the vibration of the floating body 33 can be attenuated, and the wind power generation unit 20 can be held more stably. be able to.

  Moreover, since the intermediate weight 42 is provided in the middle part of the mooring line 40, the mooring line 40 is applied to the mooring line 40 by applying the weight of the intermediate weight 42 to the mooring line 40. The mooring line 40 can be bent so as to be convex toward the bottom B. Therefore, for example, when the floating body 33 moves in the vertical direction or the horizontal direction due to waves, tidal currents, winds, etc., as shown in FIG. 6, the mooring line 40 is deformed so as to reduce or increase the deflection. By doing so, it becomes possible to gradually increase the reaction force applied from the floating body 31 to the mooring line 40, and to suppress a sudden large reaction force from being applied to the mooring line 40 from the floating body 31. it can. Therefore, for example, the mooring line 40 can be prevented from being damaged by the reaction force applied from the floating body 31 to the mooring line 40. Thereby, compared with the case where the intermediate | middle weight 42 is not provided in the mooring line 40, for example, the wind power generation part 20 can be hold | maintained more stably, making the mooring part 32 compact in a horizontal direction.

Here, FIG. 7 is a graph showing the result of the verification test regarding the effect of providing the intermediate weight 42 on the mooring line 40. The horizontal axis of the graph shown in FIG. 7 indicates the horizontal displacement, which is the amount of displacement in the horizontal direction at one end (the mooring point) of the mooring line 40. The vertical axis of the graph shown in FIG. 7 indicates the horizontal component of the mooring force as the magnitude of the reaction force acting on the mooring line 40. In this graph, the line segment L1 indicates the result of the mooring line 40 provided with the intermediate weight 42 as in the present embodiment, and the line segments L2 and L3 indicate the mooring line 40 not provided with the intermediate weight 42. Results are shown. In line segments L2 and L3, the floating part 31 is moored by the mooring part 32 by a so-called Taut mooring (tote mooring) method. Of the line segment L2 and the line segment L3, a steel rope is adopted as the mooring line 40 in the line segment L2, and the mooring line 40 is formed of synthetic fibers in the line segment L3.
From this result, it was confirmed that by providing the intermediate weight 42 on the mooring line 40, the horizontal component of the mooring force can be gently increased with the horizontal displacement.

(Second Embodiment)
Next, a floating wind power generator according to a second embodiment of the present invention will be described with reference to FIGS.
In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different points will be described.

  In the floating wind power generator 50 and the foundation structure 51 of the present embodiment, the leg member 36 is formed in a pipe shape instead of being formed in a truss shape. The leg member 36 is formed by connecting a pair of upper and lower pipe members 52 in a state of being arranged in the vertical direction, and is formed in the same shape and the same size. The outer shapes of the upper end portion and the lower end portion of each pipe member 52 are formed in a rectangular parallelepiped shape, and the outer shape of the intermediate portion located between the upper end portion and the lower end portion in each pipe member 52 is smaller in diameter than the upper end portion and the lower end portion. It is formed in a cylindrical shape. Each pipe member 52 is filled with ballast water (ballast material) (not shown).

  The plurality of leg members 36 are provided with linkage portions 53 that bend the plurality of leg members 36 in synchronization with each other. The linkage part 53 is arranged on the axis of the floating body 33. The linking part 53 is separately connected to the lower ends of the plurality of leg members 36. The weight 34 is connected to the lower end portion of the leg member 36 through the linkage portion 53.

  Here, in this embodiment, the linkage part 53 is connected to the lower end part of each leg member 36 via a hinge part 54 formed by, for example, a hinge. The hinge shaft of each hinge portion 54 extends in the circumferential direction. Moreover, in this embodiment, the connection part 53 is provided with the 1st mounting part 55 opened toward the water surface S side. The first mounting portion 55 can be fitted with a second mounting portion 56 that protrudes from the buoyancy body 35 toward the bottom B.

  In this embodiment, as shown in FIGS. 9 to 11, each leg member 36 is provided with a second knot 37b as knots 37a and 37b in addition to the first knot 37a. . The first node 37a and the second node 37b are arranged on the leg member 36 so as to be shifted from each other in the vertical direction. The second knot 37b is provided at the center of the leg member 36 in the vertical direction. In the pair of upper and lower pipe members 52, the lower end of the upper pipe member 52 and the lower end of the lower pipe member 52 are connected. It is connected.

  The first knot 37a and the second knot 37b bend the leg member 36 in opposite directions in the horizontal direction. The first knot 37a and the second knot 37b are formed by, for example, a hinge, and the first knot 37a bends the entire leg member 36 outward in the radial direction, so that the second knot 37b. Bends the lower pipe member 52 inward in the radial direction. In the present embodiment, when the plurality of leg members 36 are bent starting from the node portions 37a and 37b, the linkage portion 53 rises toward the water surface S side while bending the hinge portion 54, and each leg member A plurality of leg members 36 are linked and bent so that the central portion of 36 projects outward in the radial direction.

  Here, as shown in FIGS. 10 and 11, the leg member 36 is in a first state until the first mounting portion 55 of the linkage portion 53 and the second mounting portion 56 of the floating body 33 are fitted and engaged with each other. Each of the nodes 37a and the second nodes 37b is bent as a starting point. The first mounting portion 55 and the second mounting portion 56 are engaged with each other to restrict further bending of the leg member 36. The first mounting portion 55 and the second mounting portion 56 constitute a restricting portion 38 that restricts the bending amount of the leg member 36.

  In the method for manufacturing the floating wind power generator 50 according to the present embodiment, the ballast water is not injected into each pipe member 52 during the transfer process and the transfer process described above, and each pipe is used during the attachment process. Seawater as the parast water is injected into the material 52. At this time, as shown in FIG. 9, for example, ballast water is injected into the upper pipe member 52 of the upper and lower pipe members 52 from the opening on the lower end side of the pipe member 52, and the lower pipe member 52 Ballast water may be injected into the material 52 from the opening on the upper end side of the pipe material 52.

As described above, according to the floating wind power generator 50 and the foundation structure 51 according to the present embodiment, the first knot portion 37a and the second knot portion 37b bend the leg member 36 to the opposite sides in the horizontal direction. Therefore, the leg member 36 can be overlapped in the vertical direction by bending the joints 37a and 37b as starting points, and the size of the bent leg member 36 in the horizontal direction can be suppressed to be small. The main body 33 can be made compact. Moreover, as in the present embodiment, the first knot 37a is provided at a portion of the leg member 36 that is connected to the buoyant body 35, and the second knot 37b is provided at the center of the leg member 36 in the vertical direction. In this case, the horizontal size of the bent leg member 36 can be reduced to about half.
Thus, since the floating body 33 can be made compact, for example, when performing an assembly process of assembling the floating body 33 on the land L, space saving can be achieved, and the floating body 33 can be moved from the land L to the water. When carrying out the transfer process of transferring to the floating body, it is possible to simplify the transfer device required for transferring the floating body 33.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, the auxiliary floating body 43 may not be provided.

In the said embodiment, although the other end part of the mooring line 40 is being fixed to the bottom B by the dead weight of the weight body 41, this invention is not limited to this. For example, the other end of the mooring line 40 may be fixed by being driven into the bottom B.
In the above embodiment, the mooring line 40 is provided with the intermediate weight 42, but the mooring line 40 without the intermediate weight 42 may be adopted.

  In the embodiment, the weight 34 is suspended from the lower end of the leg member 36, but the present invention is not limited to this. For example, the weight 34 may be fixed to the lower end of the leg member 36 without the suspension line 39 and directly connected to the leg member 36.

  In addition, it is possible to appropriately replace the constituent elements in the embodiment with known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

10, 50 Surface wind power generator 20 Wind power generator 30, 51 Foundation structure 31 Floating body 32 Mooring part 33 Floating body 34 Weight 35 Buoyant body 36 Leg members 37a, 37b Node 40 Mooring line 42 Intermediate weight 43 Auxiliary floating body B Water bottom P Installation position

Claims (9)

It is a foundation structure for a floating wind power generator that holds a wind power generation unit at an offshore installation position by a floating body,
The floating body is
A buoyancy body that is disposed in water and supports the wind power generation unit, and a plurality of leg members that extend from the buoyancy body toward the bottom of the water and that circulate around the buoyancy body in a plan view of the floating body. A floating body having
A foundation structure for a water-based wind power generator, comprising: a weight attached to an end of the leg member on a water bottom side at the installation position.   The foundation structure for a water-based wind power generator according to claim 1, wherein the leg member is bent in a horizontal direction by being bent starting from a node provided in the leg member.   The water-based wind power generation according to claim 2, wherein the plurality of leg members are bent in a state where they are shifted in the circumferential direction when the leg members are bent with the node as a starting point. Basic structure for equipment.   In the leg member in a bent state bent from the node portion, an auxiliary floating body is provided at an end located on the opposite side of the buoyant body along the horizontal direction. The foundation structure for the described floating wind power generator. As the node portion, the leg member is provided with a first node portion and a second node portion arranged to be shifted from each other in the vertical direction,
5. The surface wind power generator according to claim 2, wherein the first knuckle and the second knuckle bend the leg members in opposite directions in the horizontal direction. 6. Foundation structure.   The foundation structure for a floating wind power generator according to any one of claims 1 to 5, wherein the weight is attached to the leg member so as to be able to vibrate independently of the floating body. . The floating body is moored to the bottom of the water via a mooring section;
The mooring part includes a mooring line having one end fixed to the floating body and the other end fixed to the water bottom,
A plurality of the mooring lines are arranged in the circumferential direction, and gradually move away from the floating body part in the horizontal direction from one end part toward the other end part,
The floating wind power generator according to any one of claims 1 to 6, wherein an intermediate weight is provided at an intermediate portion located between the one end portion and the other end portion of the mooring line. Foundation structure.   A wind power generator, wherein the wind power generator is held by the foundation structure for a water wind power generator according to any one of claims 1 to 7. It is a manufacturing method of the surface wind power generator which forms the surface wind power generator of Claim 8,
A transporting process for transporting the wind power generation unit to the installation position while being supported by the floating body;
And a mounting step of attaching the weight to the leg member at the installation position after the transporting step.

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